[ubuntu] KVM - Public IP Problem

Hey,


I have some problems with kvm and public ips.


my current host setup:

• Ubuntu 14.04 LTS (Server)
• 2 NICs
  
  • 1 nic with public ip address. from isp via dhcp
  • 1 nic with private network from (my) dhcp

I installed freebsd in a vm and on each physical interface created one virtual for the vm.
on the "private" side all works fine.
but on the public site some problems.
the vm got a public ip from ISPs dhcp server, but no internet connection.
neither from vm > internet nor from internet > vm.


i think it is some routing problems but no idea how to fix it.


can anyone help me ?